Security readout for executives and security teams
Plain-English summary
CVE-2020-0933 is a Microsoft SharePoint cross-site scripting issue. An attacker with low-level access could send a crafted request that, if a user interacts with it, may run script in that user's browser context. The likely business impact is limited data exposure or unauthorized actions, not service outage.
Executive priority
Treat as a moderate-priority SharePoint patching item. It is not known exploited from the provided sources, but exposed collaboration platforms should not carry known XSS flaws longer than normal patch windows.
Technical view
The flaw is CWE-79 XSS caused by improper sanitization of a specially crafted web request to affected SharePoint servers. CVSS 3.1 is 5.4: network reachable, low complexity, low privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is most likely where Microsoft SharePoint Enterprise Server 2016, SharePoint Server 2019, or SharePoint Foundation 2013 SP1 remains deployed, especially if accessible to broad internal or external authenticated users.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. Exploitation is constrained by required low privileges and user interaction, but SharePoint's collaboration role can make user-targeted XSS operationally relevant.
Researcher notes
Do not assume unauthenticated compromise or server code execution. The CVSS vector indicates PR:L and UI:R, with browser-side confidentiality and integrity impact. Source evidence does not include payload details, exploit maturity, or a named workaround.
Mitigation direction
- Review the Microsoft MSRC advisory for official updates or workarounds.
- Prioritize remediation on internet-facing or partner-accessible SharePoint servers.
- Reduce unnecessary SharePoint access until remediation is confirmed.
- Apply least-privilege permissions for SharePoint users and groups.
- Monitor Microsoft guidance for version-specific servicing requirements.
Validation and detection
- Inventory SharePoint versions and identify 2016, 2019, or Foundation 2013 SP1 deployments.
- Check each affected server against the Microsoft MSRC advisory status.
- Confirm required SharePoint security updates are installed through approved patch records.
- Review SharePoint and web logs for unusual crafted request patterns.
- Validate no unsupported SharePoint instances remain externally reachable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-0933 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0933CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.